Quantication of magnetic coercivity components by the analysis of acquisition curves of isothermal remanent magnetisation

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Quantication of magnetic coercivity components by the analysis of acquisition curves of isothermal remanent magnetisation

Kruiver, Pauline P.; Dekkers, M.J.; Heslop, David

(2001) Earth and Planetary Science Letters, volume 189, pp. 269 - 276

(Article)

Abstract

A new method of analysing isothermal remanent magnetisation (IRM) acquisition curves based on cumulative log
Gaussian analysis [Robertson and France, Phys. Earth Planet. Inter. 82 (1994) 223-234] is proposed. It is based on the
curve fitting of the IRM acquisition curve versus the logarithm of the applied field with: (i) the acquisition ... read more curve on a
linear scale, (ii) the acquisition curve expressed as a gradient, and (iii) the acquisition curve on a probability scale. Even
when a sample is not saturated, its magnetic properties can be defined, although with less certainty. The number of
magnetic components required for an optimal fit to a measured IRM acquisition curve is evaluated statistically. The
method discriminates on the basis of different mineral coercivity. Therefore, additional rock-magnetic tests are still
required to separate minerals with similar coercivities. show less